rename client -> frontend and server -> backend (#24347)

Let's use terminology that's more consistent with the app overall vs. convex.
- Vite / Next is the "frontend" command, which have clients to Convex
    but that isn't their defining quality
- Convex `dev` is the "backend" sync. There might be a Next.js server too.

GitOrigin-RevId: f733ba327ebb78cb0c1d692379aa2772128548d1

Author: ianmacartney

README.md

@@ -164,11 +164,11 @@ The `convex` script in `Justfile` automatically adds appropriate `--url` and
 To run the client web application you can run the demo Vite server via:
 
 ```bash
-npm run dev:client
+npm run dev:frontend
 ```
 
 Note that unlike the hosted Convex workflow, we don't want to run the
-`dev:server` command since `convex dev` is already running.
+`dev:backend` command since `convex dev` is already running.
 
 _The following CLI commands may be useful when interacting with your backend:_
 

demo/README.md

@@ -4,5 +4,5 @@ You're just a few clicks away from having a webapp powered by Convex.
 
 Get started by running `npm install` inside of this directory. Then, run
 `npx convex dev --url [local url] --admin-key [key]` to get the backend running
-locally. Finally, you can use `npm run dev:client` to view the frontend. We hope
-you enjoy using Convex!
+locally. Finally, you can use `npm run dev:frontend` to view the frontend. We
+hope you enjoy using Convex!

demo/package.json

@@ -2,10 +2,10 @@
   "name": "convex-tutorial",
   "version": "0.0.0",
   "scripts": {
-    "dev": "npm-run-all --parallel dev:server dev:client",
+    "dev": "npm-run-all --parallel dev:backend dev:frontend",
     "build": "vite build",
-    "dev:server": "convex dev",
-    "dev:client": "vite --open --clearScreen false",
+    "dev:backend": "convex dev",
+    "dev:frontend": "vite --open --clearScreen false",
     "predev": "convex dev --until-success"
   },
   "dependencies": {